10 Best Interior Design Firms in Singapore (August 2026)

Before the list, the checks that save the most money and heartache. The first thing I verify is registration. For any HDB flat, the firm doing your renovation should be on the HDB Directory of Registered Renovation Contractors, because only registered contractors are allowed to carry out renovation works in HDB flats, and using one keeps you on the right side of the rules for hacking, wet works and electrical changes.

The second is accreditation. The CaseTrust-RCMA joint accreditation scheme is the one I look for, because accredited firms must use a standard renovation contract, carry deposit protection, and follow a clear dispute process. It is not a guarantee of taste, but it is a strong signal that a firm handles your money and your timeline responsibly. For landed homes and bigger structural changes, check that the firm works with a BCA-licensed builder and, where addition and alteration works are involved, a qualified person such as an architect or a professional engineer.

After the paperwork, I weigh three things. Portfolio fit: do their past projects look like the home you want, in the same property type, since a firm with a wall of stunning condo interiors may have thin landed experience, and the reverse is just as true. Transparent, itemised quotes: the good firms break down carpentry, hacking, tiling and the rest, so you can compare like for like and see where the money goes. And reviews with substance: I weight Qanvast and Google reviews that describe the process, timeline and after-sales service far more than a raw star average. Because so much comes down to property type, I have dedicated guides for HDB BTO, resale HDB, condo, landed, commercial and luxury interior design, so once you know your property type you can go straight to the right shortlist. If the bedroom is next on the list, my picks of the best mattress brands in Singapore explain why the trial period matters more than the warranty. On the kitchen side, my picks of the best water purifiers and dispensers in Singapore do the rental arithmetic that vendors tend to leave out. If the problem is space rather than the move itself, my picks of the best self storage in Singapore explain why a non-aircon unit is a false economy here.

If you want the shortlist in one view, here is how the ten firms line up by what they do best and the signal I trust most for each.

The honest answer is that it depends on your property type, the scope of work and your material choices, but here are the ballpark design-and-renovation ranges I would budget for in 2026. These cover design plus the renovation itself, not furniture and appliances.

Resale flats often cost more to renovate than new BTOs, because older units usually need hacking, rewiring and re-plumbing before the nice part even begins. Landed homes sit in a different league entirely once addition and alteration works, structural changes or a rebuild are involved. Always get an itemised quote so you can see exactly what drives your number.

I weight Qanvast and Google reviews that actually describe the process, timeline and after-sales service, cross-check HDB renovation-contractor registration and CaseTrust-RCMA accreditation, and favour firms whose portfolio matches real Singapore homes rather than glossy overseas renders. Ratings and details were accurate when I wrote this, but they move, so confirm the current picture with each firm before you sign anything. I update this list when my view changes.

An interior design firm handles the design, space planning and look of your home, then manages the trades to deliver it. A renovation contractor focuses on the building works themselves, hacking, tiling, plumbing, electrical and carpentry, often without a dedicated design service. Many firms in Singapore do both under one roof, which is why the labels blur. For any HDB flat, whoever does the physical works must be on the HDB register of renovation contractors, whether you call them a designer or a contractor.

Search the firm on the HDB Directory of Registered Renovation Contractors. Only firms on that list are permitted to carry out renovation works in HDB flats, and it takes two minutes to confirm before you pay a deposit. If a firm is not on it and your home is an HDB flat, treat that as a red flag, no matter how good the portfolio looks.

For a typical HDB BTO the design and renovation runs about 8 to 12 weeks once works start, on top of a few weeks for design and approvals. Resale flats usually take a little longer, 10 to 16 weeks, because of the extra hacking and rewiring older units need. Condos vary with MCST rules and permitted working hours, and landed homes with structural or addition-and-alteration works can run many months. Build the approval and lead time into your plans, not just the renovation itself.

For a landed home, yes, and ideally one with real landed experience. Multiple storeys, larger volumes, outdoor spaces, internal staircases and any structural or addition-and-alteration works make landed projects far more complex than a flat. You want a firm that works with a BCA-licensed builder and, where the works require it, a qualified person such as an architect or professional engineer. A designer who mostly does HDB packages can be out of their depth here, so check the portfolio for genuine landed projects before you commit.